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<h2><span class="refentrytitle"><a name="GPollableOutputStream.top_of_page"></a>GPollableOutputStream</span></h2>
<p>GPollableOutputStream — Interface for pollable output streams</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="GPollableOutputStream.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<a href="../glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="GPollableOutputStream.html#g-pollable-output-stream-can-poll" title="g_pollable_output_stream_can_poll ()">g_pollable_output_stream_can_poll</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="GPollableOutputStream.html#g-pollable-output-stream-is-writable" title="g_pollable_output_stream_is_writable ()">g_pollable_output_stream_is_writable</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../glib-The-Main-Event-Loop.html#GSource"><span class="returnvalue">GSource</span></a> *
</td>
<td class="function_name">
<a class="link" href="GPollableOutputStream.html#g-pollable-output-stream-create-source" title="g_pollable_output_stream_create_source ()">g_pollable_output_stream_create_source</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="../glib-Basic-Types.html#gssize"><span class="returnvalue">gssize</span></a>
</td>
<td class="function_name">
<a class="link" href="GPollableOutputStream.html#g-pollable-output-stream-write-nonblocking" title="g_pollable_output_stream_write_nonblocking ()">g_pollable_output_stream_write_nonblocking</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GPollableOutputStream.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody>
<tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="GPollableOutputStream.html#GPollableOutputStream-struct" title="GPollableOutputStream">GPollableOutputStream</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="GPollableOutputStream.html#GPollableOutputStreamInterface" title="struct GPollableOutputStreamInterface">GPollableOutputStreamInterface</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GPollableOutputStream.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">    <a href="/home/mclasen/gnome/share/gtk-doc/html/gobject/GTypeModule.html">GInterface</a>
    <span class="lineart">╰──</span> GPollableOutputStream
</pre>
</div>
<div class="refsect1">
<a name="GPollableOutputStream.prerequisites"></a><h2>Prerequisites</h2>
<p>
GPollableOutputStream requires
 <a class="link" href="GOutputStream.html" title="GOutputStream">GOutputStream</a>.</p>
</div>
<div class="refsect1">
<a name="GPollableOutputStream.implementations"></a><h2>Known Implementations</h2>
<p>
GPollableOutputStream is implemented by
 <a class="link" href="gio-GConverterOutputstream.html#GConverterOutputStream">GConverterOutputStream</a>,  <a class="link" href="GMemoryOutputStream.html" title="GMemoryOutputStream">GMemoryOutputStream</a> and  <a class="link" href="GUnixOutputStream.html" title="GUnixOutputStream">GUnixOutputStream</a>.</p>
</div>
<div class="refsect1">
<a name="GPollableOutputStream.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include &lt;gio/gio.h&gt;
</pre>
</div>
<div class="refsect1">
<a name="GPollableOutputStream.description"></a><h2>Description</h2>
<p><a class="link" href="GPollableOutputStream.html" title="GPollableOutputStream"><span class="type">GPollableOutputStream</span></a> is implemented by <a href="GOutputStream.html#GOutputStream-struct"><span class="type">GOutputStreams</span></a> that
can be polled for readiness to write. This can be used when
interfacing with a non-GIO API that expects
UNIX-file-descriptor-style asynchronous I/O rather than GIO-style.</p>
</div>
<div class="refsect1">
<a name="GPollableOutputStream.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="g-pollable-output-stream-can-poll"></a><h3>g_pollable_output_stream_can_poll ()</h3>
<pre class="programlisting"><a href="../glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
g_pollable_output_stream_can_poll (<em class="parameter"><code><a class="link" href="GPollableOutputStream.html" title="GPollableOutputStream"><span class="type">GPollableOutputStream</span></a> *stream</code></em>);</pre>
<p>Checks if <em class="parameter"><code>stream</code></em>
 is actually pollable. Some classes may implement
<a class="link" href="GPollableOutputStream.html" title="GPollableOutputStream"><span class="type">GPollableOutputStream</span></a> but have only certain instances of that
class be pollable. If this method returns <a href="../glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a>, then the behavior
of other <a class="link" href="GPollableOutputStream.html" title="GPollableOutputStream"><span class="type">GPollableOutputStream</span></a> methods is undefined.</p>
<p>For any given stream, the value returned by this method is constant;
a stream cannot switch from pollable to non-pollable or vice versa.</p>
<div class="refsect3">
<a name="g-pollable-output-stream-can-poll.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>stream</p></td>
<td class="parameter_description"><p>a <a class="link" href="GPollableOutputStream.html" title="GPollableOutputStream"><span class="type">GPollableOutputStream</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="g-pollable-output-stream-can-poll.returns"></a><h4>Returns</h4>
<p> <a href="../glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if <em class="parameter"><code>stream</code></em>
is pollable, <a href="../glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> if not.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-28.html#api-index-2.28">2.28</a></p>
</div>
<hr>
<div class="refsect2">
<a name="g-pollable-output-stream-is-writable"></a><h3>g_pollable_output_stream_is_writable ()</h3>
<pre class="programlisting"><a href="../glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
g_pollable_output_stream_is_writable (<em class="parameter"><code><a class="link" href="GPollableOutputStream.html" title="GPollableOutputStream"><span class="type">GPollableOutputStream</span></a> *stream</code></em>);</pre>
<p>Checks if <em class="parameter"><code>stream</code></em>
 can be written.</p>
<p>Note that some stream types may not be able to implement this 100%
reliably, and it is possible that a call to <a class="link" href="GOutputStream.html#g-output-stream-write" title="g_output_stream_write ()"><code class="function">g_output_stream_write()</code></a>
after this returns <a href="../glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> would still block. To guarantee
non-blocking behavior, you should always use
<a class="link" href="GPollableOutputStream.html#g-pollable-output-stream-write-nonblocking" title="g_pollable_output_stream_write_nonblocking ()"><code class="function">g_pollable_output_stream_write_nonblocking()</code></a>, which will return a
<a class="link" href="gio-GIOError.html#G-IO-ERROR-WOULD-BLOCK:CAPS"><code class="literal">G_IO_ERROR_WOULD_BLOCK</code></a> error rather than blocking.</p>
<div class="refsect3">
<a name="g-pollable-output-stream-is-writable.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>stream</p></td>
<td class="parameter_description"><p>a <a class="link" href="GPollableOutputStream.html" title="GPollableOutputStream"><span class="type">GPollableOutputStream</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="g-pollable-output-stream-is-writable.returns"></a><h4>Returns</h4>
<p> <a href="../glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if <em class="parameter"><code>stream</code></em>
is writable, <a href="../glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> if not. If an error
has occurred on <em class="parameter"><code>stream</code></em>
, this will result in
<a class="link" href="GPollableOutputStream.html#g-pollable-output-stream-is-writable" title="g_pollable_output_stream_is_writable ()"><code class="function">g_pollable_output_stream_is_writable()</code></a> returning <a href="../glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a>, and the
next attempt to write will return the error.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-28.html#api-index-2.28">2.28</a></p>
</div>
<hr>
<div class="refsect2">
<a name="g-pollable-output-stream-create-source"></a><h3>g_pollable_output_stream_create_source ()</h3>
<pre class="programlisting"><a href="../glib-The-Main-Event-Loop.html#GSource"><span class="returnvalue">GSource</span></a> *
g_pollable_output_stream_create_source
                               (<em class="parameter"><code><a class="link" href="GPollableOutputStream.html" title="GPollableOutputStream"><span class="type">GPollableOutputStream</span></a> *stream</code></em>,
                                <em class="parameter"><code><a class="link" href="GCancellable.html" title="GCancellable"><span class="type">GCancellable</span></a> *cancellable</code></em>);</pre>
<p>Creates a <a href="../glib-The-Main-Event-Loop.html#GSource"><span class="type">GSource</span></a> that triggers when <em class="parameter"><code>stream</code></em>
 can be written, or
<em class="parameter"><code>cancellable</code></em>
 is triggered or an error occurs. The callback on the
source is of the <a class="link" href="gio-gpollableutils.html#GPollableSourceFunc" title="GPollableSourceFunc ()"><span class="type">GPollableSourceFunc</span></a> type.</p>
<p>As with <a class="link" href="GPollableOutputStream.html#g-pollable-output-stream-is-writable" title="g_pollable_output_stream_is_writable ()"><code class="function">g_pollable_output_stream_is_writable()</code></a>, it is possible that
the stream may not actually be writable even after the source
triggers, so you should use <a class="link" href="GPollableOutputStream.html#g-pollable-output-stream-write-nonblocking" title="g_pollable_output_stream_write_nonblocking ()"><code class="function">g_pollable_output_stream_write_nonblocking()</code></a>
rather than <a class="link" href="GOutputStream.html#g-output-stream-write" title="g_output_stream_write ()"><code class="function">g_output_stream_write()</code></a> from the callback.</p>
<div class="refsect3">
<a name="g-pollable-output-stream-create-source.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>stream</p></td>
<td class="parameter_description"><p>a <a class="link" href="GPollableOutputStream.html" title="GPollableOutputStream"><span class="type">GPollableOutputStream</span></a>.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>cancellable</p></td>
<td class="parameter_description"><p>a <a class="link" href="GCancellable.html" title="GCancellable"><span class="type">GCancellable</span></a>, or <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="g-pollable-output-stream-create-source.returns"></a><h4>Returns</h4>
<p>a new <a href="../glib-The-Main-Event-Loop.html#GSource"><span class="type">GSource</span></a>. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-28.html#api-index-2.28">2.28</a></p>
</div>
<hr>
<div class="refsect2">
<a name="g-pollable-output-stream-write-nonblocking"></a><h3>g_pollable_output_stream_write_nonblocking ()</h3>
<pre class="programlisting"><a href="../glib-Basic-Types.html#gssize"><span class="returnvalue">gssize</span></a>
g_pollable_output_stream_write_nonblocking
                               (<em class="parameter"><code><a class="link" href="GPollableOutputStream.html" title="GPollableOutputStream"><span class="type">GPollableOutputStream</span></a> *stream</code></em>,
                                <em class="parameter"><code>const <span class="type">void</span> *buffer</code></em>,
                                <em class="parameter"><code><a href="../glib-Basic-Types.html#gsize"><span class="type">gsize</span></a> count</code></em>,
                                <em class="parameter"><code><a class="link" href="GCancellable.html" title="GCancellable"><span class="type">GCancellable</span></a> *cancellable</code></em>,
                                <em class="parameter"><code><a href="../glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **error</code></em>);</pre>
<p>Attempts to write up to <em class="parameter"><code>count</code></em>
 bytes from <em class="parameter"><code>buffer</code></em>
 to <em class="parameter"><code>stream</code></em>
, as
with <a class="link" href="GOutputStream.html#g-output-stream-write" title="g_output_stream_write ()"><code class="function">g_output_stream_write()</code></a>. If <em class="parameter"><code>stream</code></em>
 is not currently writable,
this will immediately return <a class="link" href="gio-GIOError.html#G-IO-ERROR-WOULD-BLOCK:CAPS"><code class="literal">G_IO_ERROR_WOULD_BLOCK</code></a>, and you can
use <a class="link" href="GPollableOutputStream.html#g-pollable-output-stream-create-source" title="g_pollable_output_stream_create_source ()"><code class="function">g_pollable_output_stream_create_source()</code></a> to create a <a href="../glib-The-Main-Event-Loop.html#GSource"><span class="type">GSource</span></a>
that will be triggered when <em class="parameter"><code>stream</code></em>
 is writable.</p>
<p>Note that since this method never blocks, you cannot actually
use <em class="parameter"><code>cancellable</code></em>
 to cancel it. However, it will return an error
if <em class="parameter"><code>cancellable</code></em>
 has already been cancelled when you call, which
may happen if you call this method after a source triggers due
to having been cancelled.</p>
<p>Virtual: write_nonblocking</p>
<div class="refsect3">
<a name="g-pollable-output-stream-write-nonblocking.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>stream</p></td>
<td class="parameter_description"><p>a <a class="link" href="GPollableOutputStream.html" title="GPollableOutputStream"><span class="type">GPollableOutputStream</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p>a buffer to write
data from. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=count][<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> guint8]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>count</p></td>
<td class="parameter_description"><p>the number of bytes you want to write</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>cancellable</p></td>
<td class="parameter_description"><p>a <a class="link" href="GCancellable.html" title="GCancellable"><span class="type">GCancellable</span></a>, or <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>error</p></td>
<td class="parameter_description"><p><a href="../glib-Error-Reporting.html#GError"><span class="type">GError</span></a> for error reporting, or <a href="../glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> to ignore.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="g-pollable-output-stream-write-nonblocking.returns"></a><h4>Returns</h4>
<p> the number of bytes written, or -1 on error (including
<a class="link" href="gio-GIOError.html#G-IO-ERROR-WOULD-BLOCK:CAPS"><code class="literal">G_IO_ERROR_WOULD_BLOCK</code></a>).</p>
</div>
</div>
</div>
<div class="refsect1">
<a name="GPollableOutputStream.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GPollableOutputStream-struct"></a><h3>GPollableOutputStream</h3>
<pre class="programlisting">typedef struct _GPollableOutputStream GPollableOutputStream;</pre>
<p>An interface for a <a class="link" href="GOutputStream.html" title="GOutputStream"><span class="type">GOutputStream</span></a> that can be polled for readability.</p>
<p class="since">Since: <a class="link" href="api-index-2-28.html#api-index-2.28">2.28</a></p>
</div>
<hr>
<div class="refsect2">
<a name="GPollableOutputStreamInterface"></a><h3>struct GPollableOutputStreamInterface</h3>
<pre class="programlisting">struct GPollableOutputStreamInterface {
  GTypeInterface g_iface;

  /* Virtual Table */
  gboolean     (*can_poll)          (GPollableOutputStream  *stream);

  gboolean     (*is_writable)       (GPollableOutputStream  *stream);
  GSource *    (*create_source)     (GPollableOutputStream  *stream,
				     GCancellable           *cancellable);
  gssize       (*write_nonblocking) (GPollableOutputStream  *stream,
				     const void             *buffer,
				     gsize                   count,
				     GError                **error);
};
</pre>
<p>The interface for pollable output streams.</p>
<p>The default implementation of <em class="parameter"><code>can_poll</code></em>
 always returns <a href="../glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a>.</p>
<p>The default implementation of <em class="parameter"><code>write_nonblocking</code></em>
 calls
<a class="link" href="GPollableOutputStream.html#g-pollable-output-stream-is-writable" title="g_pollable_output_stream_is_writable ()"><code class="function">g_pollable_output_stream_is_writable()</code></a>, and then calls
<a class="link" href="GOutputStream.html#g-output-stream-write" title="g_output_stream_write ()"><code class="function">g_output_stream_write()</code></a> if it returns <a href="../glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a>. This means you only
need to override it if it is possible that your <em class="parameter"><code>is_writable</code></em>

implementation may return <a href="../glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> when the stream is not actually
writable.</p>
<div class="refsect3">
<a name="GPollableOutputStreamInterface.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="struct_members_name">
<col class="struct_members_description">
<col width="200px" class="struct_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GPollableOutputStreamInterface.can-poll"></a>can_poll</code></em> ()</p></td>
<td class="struct_member_description"><p>Checks if the <a class="link" href="GPollableOutputStream.html" title="GPollableOutputStream"><span class="type">GPollableOutputStream</span></a> instance is actually pollable</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GPollableOutputStreamInterface.is-writable"></a>is_writable</code></em> ()</p></td>
<td class="struct_member_description"><p>Checks if the stream is writable</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GPollableOutputStreamInterface.create-source"></a>create_source</code></em> ()</p></td>
<td class="struct_member_description"><p>Creates a <a href="../glib-The-Main-Event-Loop.html#GSource"><span class="type">GSource</span></a> to poll the stream</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GPollableOutputStreamInterface.write-nonblocking"></a>write_nonblocking</code></em> ()</p></td>
<td class="struct_member_description"><p>Does a non-blocking write or returns
<a class="link" href="gio-GIOError.html#G-IO-ERROR-WOULD-BLOCK:CAPS"><code class="literal">G_IO_ERROR_WOULD_BLOCK</code></a></p></td>
<td class="struct_member_annotations"> </td>
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</tbody>
</table></div>
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<p class="since">Since: <a class="link" href="api-index-2-28.html#api-index-2.28">2.28</a></p>
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<div class="refsect1">
<a name="GPollableOutputStream.see-also"></a><h2>See Also</h2>
<p><a class="link" href="GOutputStream.html" title="GOutputStream"><span class="type">GOutputStream</span></a>, <a class="link" href="GFileDescriptorBased.html" title="GFileDescriptorBased"><span class="type">GFileDescriptorBased</span></a>, <a class="link" href="GPollableInputStream.html" title="GPollableInputStream"><span class="type">GPollableInputStream</span></a></p>
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